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A Nano quiescent current Power Management for Autonomous Wireless Sensor Network dedicated to indoor and outdoor Photovoltaic (PV) Energy Harvesting is presented. The standby current consumption is 130nA @ 2.4V The battery can be charged with less than 5% of the harvested energy from low light (70 lux) to high light (1 sun). The IP starts charging at light level as low as 10 lux providing ≃ 1μW. The...
Coin cell batteries have been used in low current application in the past. Due to their low cost and small size, they are an attractive option for use in wireless sensor networks. The rated capacity of a coin cell batter is not achievable. In fact, the achievable life time could be significantly shorter mainly due to characteristics of the draw currents in wireless applications. Measurements have...
A wireless multi-function biosensor that measures a potential difference between two proximal electrodes on the skin, enables monitoring of vital functions - heart activity and respiration. The sensor is designed as a small plaster-like reusable unit that can be easily fixed onto the body surface and is therefore minimally obtrusive for users. It is equipped with a signal acquisition unit, a processor...
Wireless sensor networks (WSNs) are commonly considered as a key enabling technology for ambient assisted living (AAL) and smart home services. Essential requirements for this kind of applications are: small node size, long lifetime, little invasiveness and reliable communication over a range of few tens of meters even in presence of obstacles. For this reason, in this paper a low-cost WSN node architecture...
Utilities require improved monitoring of their assets to ensure reliable power for their customers. Sensors presently available in the market cater to measuring multiple asset parameters and thus are expensive. This inhibits the utilities' ability to deploy such sensors on a large scale. This paper addresses design and implementation of a low cost self-powered “Stick-on” wireless current and temperature...
Ambient Assisted Living is pushing the development of innovative wireless monitoring solutions. Most of the available solutions are based on well known wireless communication standards, such as Wi-Fi, Bluetooth or ZigBee. Moreover, there are also a few proprietary solutions, including those designed specifically for biomedical monitoring applications. The success of those solutions depends on many...
The paper reports on the development of an energy optimized wireless sensor node for building climate control application. The presented sensor uses a small photovoltaic module to harvest the energy from indoor light. The average current consumption of the every minute measuring and transmitting node is 2.5μA. Due to its ultra low power consumption the sensor node needs only 100lx of fluorescent light...
The output power of transmitter in wireless applications should be adjusted dynamically with the change of environments to implement the power management. In this paper, a two-way power management algorithm based on real-time path loss of propagation channel was implemented and validated in a point-to-point wireless system worked at 2.45 GHz. The performance of the power management was testified and...
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